Without getting into all the other issues recently discussed, in the
USA, the system must (by law in places where duracool is legal) be
converted to R134-a first.  Refrigerants cannot be mixed, so the system
would have to be evacuated before using something like duracool anyway.

Mikel

Mike Miller wrote:
> Volks,
>
> Is it OK to use one of the butane based working fluids, Duracool in this
> case, in an R12a system?
>
> Mike
>